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Surface Water Quantity — Flood Risk
 
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Living near a river has many advantages, but it also exposes people and properties to certain risks. One of the risks is getting hit by floods, which can cause damage to life and property. The adverse effects of floods vary widely, from minor inconvenience of road-side puddles to loss of life.

Managing flood risk starts by identifying the areas of land adjacent to stream and rivers that are flood-prone at various frequencies (or with different return periods).

In the Rideau Valley, planning and development approval policies prohibit or carefully control new development in areas that are expected to be flooded during a 1:100 year flood, or more frequent floods. The 1:100 year flood has a 1% chance each year of being equaled or exceeded.

The flood risk mapping is used in the RVCA regulations work and in the municipal land use planning process to ensure that new development does not add to the risk of flood damages or public safety risks associated with flooding. The mapping is also used in the flood forecasting and warning program to identify the areas that can be expected to have problems when flood events occur. The mapping is an essential starting point for the planning of flood protection works.

Flood plain mapping has been produced for more significant developed areas of the Rideau watershed where there is a recognized potential for flood damages.

In this section, you can view the available flood risk maps for the Rideau River Watershed.

In general, flood plain mapping is a four step process involving the application of modern tools and analytical methods in computer-based topographic mapping and hydrology and open channel hydraulics.

Step 1 – preparation of accurate topographic mapping of the river and the adjacent lands

Step 2 – calculation of the expected river flow (or discharge) for different return periods (or flood frequencies) by using statistical hydrology methods, if there are sufficient records of historical streamflow, or using mathematical hydrologic models, or both

Step 3 – calculation of expected water levels along the river for the expected discharges, using mathematical models that simulate the hydraulic characteristics of the river and its flood plain

Step 4 – plotting flood lines on the mapping to illustrate the areas that are expected to be inundated

The required studies are undertaken by qualified professionals, to technical standards that are prescribed by the Ministry of Natural Resources.

Within the Rideau Watershed, several floodplain mapping projects have been conducted during the last three decades. Digital versions of the more recent floodplain mapping studies are available below; while for the older reports, a reference list is provided below. All flood map sheets (from the studies listed below) are available in hardcopy or in digital format from RVCA – Please send requests to Ferdous Ahmed at ferdous.ahmed@rvca.ca at (613) 692-3571 ext. 1170.
 
 
 
 
 
 
   Floodplain Mapping Study Reports
 
NOTE: Follow the link below to the desired study and right click on the report or map to download the PDF to your computer — Please note these are large PDF files.
 
  Ottawa River Flood Risk Mapping Project — October 2014
 
  Cardinal Creek Flood Risk Mapping Project — October 2014
 
    Map D 4     Map D11
    Map D 5     Map D12
           
  Kemptville Creek Flood Risk Mapping Project — March 2009
       
  Hydraulics and Mapping Report
  Hydrology Report
  Kemptville Mapping Final Report
  (March 27, 2009)
  Kemptville Design Flows (October 27, 2007)
  Floodplain Delineation Revision 1
  (June 3, 2011)
  Kemptville Catchments Map (pdf 630 kb)
  • Floodplain Delineation Revision 2
  (June 3, 2011)
   
  • Floodplain Delineation Revision 3
  (June 3, 2011)
   
  • Tables 4 and 5 (Revision 1 - June 3, 2011)    
  • Appendix A (Revision 1 - June 3, 2011)    
       
       
  Maps, Revision 1 – June 3, 2011 (pdf files — approx. 17 mb)
       
  Index Map
Map 01
Map 02
Map 03
Map 04
Map 05
Map 06
Map 07
Map 08
Map 09
Map 10
Map 11
Map 12
Map 13
  Map 14
Map 15
Map 16

Map 17
Map 18
Map 19
Map A
Map B
Map C
Map D
Map E
Map F
Map G
       
 
  Jock River Flood Risk Mapping Project — June 2005
       
  Summary Report
June 2005 Jock River Flood Risk Mapping (within the City of Ottawa)
         
  Hydraulics   Hydrology
    Hydraulics Report — Nov. 2004
Appendix A

Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
  Hydrology Report — July 2004
Appendix A

Appendix B
Appendix C
Appendix D
Appendix E
           
           
  Maps      
    Map 01
Map 02
Map 03
Map 04
Map 05
Map 06
Map 07 A
Map 08 B
    Map 09 C
Map 10
Map 11
Map 12
Map 13
Map 14
Map 15
       
   
 
  Tay River Flood Risk Mapping Project — December 2010
       
  Tay River Flood Risk Mapping Final Report
         
         
  Maps      
    Index Map
Map 01
Map 02
Map 03
    Map 04
Map 05
Map 06
         
   
 
  Tay River Flood Risk Mapping from Glen Tay Road to Lower Rideau Lake — February 2013
       
  Tay River Flood Risk Mapping Final Report (14 MB)
 
  Blueberry Creek Flood Risk Mapping — July 2010
   
  Blueberry Creek Flood Risk Mapping Report (July 2, 2010)
  Flood Plain Deliniation Revision 004/2011 (October 11, 2011)
  Table 5 Revision 004/2011 (October 11, 2011)
  Figure 3 Revision 004/2011 (October 11, 2011)
  Figure 4 Revision 004/2011 (October 11, 2011)
  Appendix A & B Revision 004/2011 (October 11, 2011)
 
  Rideau River Flood Risk Mapping — Poonamalie Dam to Smiths Falls — February 2010
   
  Rideau River Flood Risk Mapping – Poonamalie Dam to Smith Falls Report
         
 
  Villiage of Richmond Flood Risk Mapping — Van Gaal and Arbuckle Municipal Drains — November 2009
   
  Village of Richmond Flood Risk Mapping Final Report
         
         
  Maps      
  All Maps (11 MB)      
         
         
 
  Otter Lake Regulatory Flood Level Project — June 2011
   
  Report on the analysis of regulatory flood level on the shoreline of Otter Lake (29 MB)
         
 
  Otty Lake Regulatory Flood Level Project — August 2011
   
  Report on the analysis of regulatory flood level on the shoreline of Otty Lake (18 MB)
         
 
  Big Rideau Lake Regulatory Flood Level Project — February 2012
   
  Report on the analysis of regulatory flood level on the shoreline of Big/Lower Rideau Lake
(20 MB)
 
NOTE: This is the most recent/revised report, replacing the previous report dated October 18, 2011
 
  Bob's Lake Regulatory Flood Level Project — February 2012
   
  Report on the analysis of regulatory flood level on the shoreline of Bobs Lake (20 MB)
 
NOTE: This is the most recent/revised report, replacing the previous report dated October 18, 2011
 
  Upper Rideau Lake Regulatory Flood Level Project — February 2012
   
  Report on the analysis of regulatory flood level on the shoreline of Upper Rideau Lake (29 MB)
 
Other Flood Risk Mapping Projects (not all digital files available)
 

Superseded: Ottawa River Flood Plain Mapping prepared by MacLaren Plansearch, December 1984.
Appendix A
Appendix B
Appendix C

Report on Flood Risk Mapping of Rideau River from Mooneys Bay to Rideau Falls, prepared by A. J. Robinson & Associates Inc., March 1984.

Report on Rideau River Floodline Mapping (Smiths Falls to Kars), prepared by James F. MacLaren Limited, June 1976.

Rideau River Floodline Mapping: Regional Road 6 to Burritts Rapids: General Report, prepared by Robinson Consultants Inc., February 2003.

Rideau River Flood Risk Mapping Study: Mooneys Bay to Regional Road 6, prepared by M. M. Dillon Limited, February 1989.

Rideau River Floodline Mapping, Tributaries - Smiths Falls to Kars, prepared by J.F. MacLaren, February 1983.d

Rideau River Floodline Mapping (Smiths Falls to Poonamalie), prepared by J.F. MacLaren, January, 1979.

Steven Creek Floodplain Mapping, prepared by Robinson Consultants, May 1995.

Superseded: Tay River Flood Plain Mapping, prepared by FENCO Consultants Limited, January 1981. (42 MB)